Partial discharge investigation and electric field analysis of different oscillation modes of water droplets on the surface of polymeric insulator under tangential AC electric field stress

This paper presents the comparison of water droplets on insulating surface under alternating current (AC) and direct current (DC) electric field. Besides that, it is demonstrated about the insulator deterioration under both electric field stressed due to an ageing and partial discharge (PD) phenomenon. The vital parameters factors are water droplets conductivity, droplet volume, surface roughness and droplet positioning that they cause to occur the electric field intensification. The field is intensified at the interface between the droplet, air and insulating material. Thus, the PD occurred due to electric field intensification increases with the deformed droplet. The deformation of water droplet under AC electric field stress is more intense than DC field. The electrostatic forces change the droplet shapes and spread them along the electric field direction. The local electric field intensification provokes the PD giving way to reduction of hydrophobicity of insulator surfaces. In addition, the PD activity could appear as a trigger for a surface breakdown. And the localized arcs cause damage to insulating material then finally leads to deterioration of insulation materials and the pollutant contamination.

Download Full-text

A New Approach to Study Partial Discharge Inception due to Particles in Transformer Oil Using Electric Field Analysis

2019 International Conference on High Voltage Engineering and Technology (ICHVET) ◽

10.1109/ichvet.2019.8724179 ◽

2019 ◽

Author(s):

Muhammed Faisal Rahman ◽

Pradeep Nirgude

Keyword(s):

Electric Field ◽

Partial Discharge ◽

Transformer Oil ◽

Field Analysis ◽

New Approach ◽

Electric Field Analysis

Download Full-text

Investigation of Uniform and Non-Uniform Water Droplets on Different Configurations of Silicon Rubber Composite Insulators Subjected to AC Electric Field Stress

2020 3rd International Conference on Energy, Power and Environment: Towards Clean Energy Technologies ◽

10.1109/icepe50861.2021.9404509 ◽

2021 ◽

Author(s):

H.P. Shrimathi ◽

Mithun Mondal

Keyword(s):

Electric Field ◽

Water Droplets ◽

Silicon Rubber ◽

Field Stress ◽

Ac Electric Field ◽

Rubber Composite

Download Full-text

The Effect of Deterioration on Insulating Surface due to Flashover under AC Electric Field Stressed by Water Droplets

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.931-932.979 ◽

2014 ◽

Vol 931-932 ◽

pp. 979-983

Author(s):

Sackthavy Chandavong ◽

Kittipong Tonmitr ◽

Arkom Kaewrawang

Keyword(s):

Electric Field ◽

Water Drop ◽

Partial Discharge ◽

Water Droplets ◽

Humidity Effect ◽

Insulator Surface ◽

Ac Electric Field ◽

Flashover Voltage ◽

Alternative Current ◽

Lower Voltage

This paper presents the effect of the flashover on insulating surface under alternative current (AC) electric field stressed by humidity factor. It is obviously demonstrated about the insulator deterioration due to an ageing, partial discharge (PD) when it is used in services. Epoxy resin with the water droplets is brought to test by high voltage AC until flashover voltage levels. The flashover level on insulator surface depends on the volume and the number of the water droplets. The highest flashover voltage is 52.2 kV for the insulator surface without humidity, but the lowest voltage is 43.5 kV for water droplets of 1, 2, 3 and 4 drops (0.5, 1.0, 1.5 and 2.0 ml). Consequently, it leads to use the lower voltage respectively. The deformation of the water drop was oscillated, moved, elongated and broken up in to a several small drops on insulating surface. PD was the result of the flashover phenomena which causes the damage of the insulator. These results lead to protect the insulator surface under humidity effect from flashover phenomena.

Download Full-text

Study on Partial Discharge with Water Droplets on the Circular Epoxy Resin Insulator under AC Electric Field Stress

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.931-932.968 ◽

2014 ◽

Vol 931-932 ◽

pp. 968-972

Author(s):

Soukvilay Phimmasene ◽

Kittipong Tonmitra ◽

Apirat Siritaratiwat ◽

Arkom Kaewrawang

Keyword(s):

Distribution System ◽

Partial Discharge ◽

Single Drop ◽

Water Droplets ◽

Electrical Field ◽

Voltage Level ◽

Field Stress ◽

Ac Electric Field ◽

Influence Of Water ◽

Main Factor

The partial discharge on the insulator surfaces usually occurred in the distribution system. The influence of water droplets is investigated in this paper. This experiment used a circular resin specimen under High Voltage Alternating Current (HVAC) field stress that was applied to the electrodes with a diameter of 2 mm and with a distance between both electrodes of 35 mm. For this methodology, both a single droplet and also double droplets were used on surfaces and the voltage level was adjusted by 15 kV. Results showed that, firstly, the corona phenomenon occurred around the circular electrode after the water droplets on the specimen surface were stretched to each other, but the double drops took a lower voltage level for the stretching than the single drop. In addition, the double drops acted as a bridge, allowing an electrical field to be generated from both electrodes. This pulled them, easily resulting in arcing. In conclusion, water droplets are a main factor to the aging that occurred on the insulators surfaces and this effect is presented in this experiment.

Download Full-text